Question about Acer AL1721 17" Flat Panel LCD Monitor

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Broken inverter for al1721.

I have the exact same symptoms, except my l102-component has been soldered perfectly. What kind of component could be broken on my inverter?

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Polaroid 3211-TLXB solarized / negative image


Just replace the T-Con board and you dont need any soldering at all. JUst be careful for the flex connector.

Jan 19, 2015 | Polaroid 3211TLXB 32 in. LCD Television

1 Answer

No picture no sound just a black screen


I just repaired this LCD tv exact same model.
symptoms- when the tv turns on, all I get is a black screen with blinking green light. No other error codes. It was crazy frustrating trouble shooting this. I measured the transformers on the master and slave inverter board with a multi meter. The resistance should be 1.31 k ohms. All but one measured within the specs except one. I get an OL reading. I took a chance to order this part on eBay for 13 dollars. After soldering it, the resistance for all of the transformers were back to specs. The tv powered on and stayed on. Works good as new. If anyone has the this similar issue I would advice testing the mini transformers on your master and slave inverter board. My email is normanw1@yahoo.com for help.

lcc5255u aquos fixed
lcc5255u aquos resolved

Apr 10, 2014 | Sharp LC-C5255U 52 in. LCD TV

1 Answer

The screen on my HP compaq nc8000 laptop goes blacks usually after the screen has been closed. the screen is very dark after is hardly visible except when squinting. does anyone know what the problem is or...


The culprit will be the inverter board of your LCD screen that drives the backlight, my nc8000 shows the same symptoms after 6 years of heavy daily usage. After pressing the LID sensing button near the right hinge the backlight usually remains on, but sometimes you have to press it several times under a minute once it finally stays on. The proper fix would be to disassemble the screen and replace the inverter board, as the LCD and the CCFL backlight tubes are perfectly fine in my case.

On how to remove the screen from the laptop, you can get help from this HP guide:
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00803690/c00803690.pdf
(it's in section 5-35, that starts on page 128)

Unfortunately, I can't help you out on the other part, on how to disassemble the screen itself (but I suspect it has 4 or 6 screws under the rubber "feets" on its front), and I can't help you out in fixing the inverter board itself either...
If you want to fix the board yourself, you have to be able to wield the soldering iron perfectly, and your goal will be to replace some capacitors (they are usually bulging, so you can identify them being the culprit by the naked eye too).
The other option is to order a replacement inverter board, and simply swap the bad with the new one, it is still more economical than to buy a new display assembly as a whole; some chinese manufacturers are available, but I bet you can find some source more closely to your current location, just google for:
hp nc8000 inverter board

Aug 12, 2010 | HP Compaq Business nc8000 Notebook

1 Answer

Acer AL1721 lcd monitor is cycling on and off every 2 seconds. Screen flickers and power and menu lights come on, then go off and starts again. Something on the power board I guess but can't see any...


The caps can have high ESR (Equivalent Series Resistance) with no sign of bulging. You should replace the whole set of the DC filter caps for the 5vdc and the 12vdc powers upply section.
http://www.fixya.com/support/r4890640-panasonic_fm_fc_series_caps_repair


Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed ACER monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Service manual: http://elektrotanya.com/?q=showresult&megnev=ACER&megnev2=AL1721&kategoria=&kat2=schematics

Jun 17, 2010 | Acer AL1721 17" Flat Panel LCD Monitor

1 Answer

Hi, Can anyone help me with my problem please, I have an Acer AL1721 monitor which after it has been on for 10 mins or so, starts to play up. It does not have any dead pixels or anything, but it keeps...


You may have power supply failing due to bad caps.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed ACER monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

May 25, 2010 | Acer AL1721 17" Flat Panel LCD Monitor

2 Answers

The radio's ac adapter does plug in


what kind of ac adaptor for mikita bmr 100

Dec 20, 2008 | Makita BMR100 Radio

1 Answer

Acer AL1512 LCD Monitor Problem


Hi,

Based on your description, the problem could either be:
  • CCF (cold cathode florescent) lamp; and/or
  • inverter.
Since the Acer AL1512 works fine except dark, we can rule out the video interface, power supply and ontroller. Again, the display showing (even dimly) is significant, it tells us that the components are working except that for some reason and most likely it is heat related. Possibly a cold solder, a loose connection and/or a dried up capacitor. You could actually verify this be shining a flashlight diagonally across the screen and some semblance of the desktop albeit dark would be slightly visible.

What is required is opening the LCD lid/panel to perform repairs. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Sep 23, 2008 | Acer AL1512 15" LCD Monitor

17 Answers

Monitor keeps going blank at start up


This looks to be a power supply fault - the inverters for the backlights are built into the power supply (Delta Electronics, model no. ADP-40AF).

Aug 10, 2007 | Acer AL1715 (Black, Silver) 17" LCD...

1 Answer

Microwave shuts off after 3 seconds


Although your model number doesn't seem to show up, the NNS950-series units are powered by an high-voltage inverter. And yours has failed. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Sometimes a whole new inverter is cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized appliance / microwave repair shops and ask then specifically about inverter component-level repair and simple inverter replacement costs for your exact model number.

Dec 26, 2006 | Panasonic NN-S950WA Microwave Oven

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